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Mark Zuckerberg, co-founder and chief executive officer of Facebook Inc., arrives on stage for a keynote session at the Mobile World Congress in Barcelona, Spain, on Monday, March 2, 2015. The event, which generates several hundred million euros in revenue for the city of Barcelona each year, also means the world for a week turns its attention back to Europe for the latest in technology, despite a lagging ecosystem. Photographer: Pau Barrena/Bloomberg *** Local Caption *** Mark Zuckerberg